Stoping drill



May 31, 1932. G. M. NELL STOPING DRILL Filed April 6, 1929 2 Sheets-Sheet l v MTORNEY.

May 31, 1932; G. M. NELL.

STOPING DRILL v 2 Sheets-Sheet 2 Filed April 6. 1929 INVENTOR: Gus fave M A/e// ATTORNEY.

I when the .drill steel becomeszstuok.

Patented May 31, 1932 ensTAvEM. .NEL or' nnmnoir, MICHIGAN. AssIonoR T0 omoaeo .rnnmvriirto moon ooMnANv,.oF NEW YORK, 1v.

A ooneoearloiv 0:; new iJERSEY 'STOPING DRILL This invention relates to==a;pparatus fon rock drilling. More particularly it concerns feeding means for percussive motors, such as are commonly used on stoping drills.

.Qne object of the invention is to provide a feeding device for .selfaotatin-g stopers which will preventzthe entire machine from rotating Another object is to enable the machine to be rotated manually through a sutlic'i'ent arc to aid in loosening a stuck drill steel. Another object is-to improve prior apparatus of this general character. Still further objeots will be apparent from the detailed description which follows.

'In order to illustrate the invention preferred embodiments thereof are shown in the accompanying-drawings; in which: q

Fig. I is avertical sectional view illustrating a stoping drill in position for operation;

Fig. 2 is an. enlarged sectional view of a detail of the feeding device of F ig. 1 showing the connection between the telescoping parts substantially on the line 22 of Fig. 8;

Fig. 3 is a transverse sectional view substantially on the line 3.-3 ofFig. 2

Fig. 4 is a sectional view showing reversed connections for the telescoping members and a clamping support engaging one of them 5 is an elevational view of the support shown in Fig. 4;; 1 Fig. 6 is a fragmentary sectional view through the lower end of a feeding device showing a modification; p

Fig. 7 is a sectional View substantially on the line 7-7 of Fig. 6:;

Fig. 8 is a sectional view similar to Fig. {5 showing still-another modification; and

Land 10 are fragmentary views at right angles to each other showing the manner of .connecting' the feeding device to a column.

Fig. lv illustrates a stoping drill embodying one form of the invention in position for operation. The drill comprises a percussive motor A adapted to impart blows and to rotate a drill steel a supported in the forward end thereof and having a feeding device B -for advancing the motor and the steel .to the work. While the percussive Application filed" April c, 1929.

of the motor A 'ga-ge'ment with a wall or a stone.

Serial mfssaeoa;

operation. -Hand-1o 0 is alsoused to free the 3 machine when the drill steel a becomes stuck in the, formation which is being (flail-lied. Since motor A is'of the self rotating type,

sticking of the steel tends to :cause the entire machine to" rotate 'unless suitable means are provided between the motor and thersnpport.

The feeding device shown is of the fluid pressure type and consistsof telescoping members 7' and v8., one of which isseoured to the drill and the other engages or isflen- :gaged by a support. Member 7 is a feed leg cylinder secured to motor A, and member -8 'a piston slidable within cylinder 7. ing device is arranged to preventirotati-on when the steel a becomes stuck and yet is arranged to permit a limited amount of rotative movement nelativetothe support so that the operator may ntilize handle C to assist in freeing the steel. i Suitable means may be secured to the lowerend of piston 8 to engage the support and to resi-strotative movement. In the term of the invention shown Fig. 1 such means take the form of a foot'piece 9 having at least two pointslO to engage a supporting surface. Alternatively or additionally, a hole 11in the foot piece may be utilized to sheet va's'ecure anchorage or to resist movement by inserting a bar therethrough for enerence foot piece '9 has a tongue 12 which extends into a recess or slot in the end of piston 8 and is securedthereinbya pivot pin The means permitting free longitudinal movement of the piston 8 infcylinder 7, 'hu-t permitting only limited rotative movement of cylin-der7 and 9, will now be described. Piston 8 has one or more grooves 14 which receives -'a By prefmotor may have independent :means for roprojects from the machine to The feedi motorA relative to foot piece drill steel a is stuck in rotation train is so arranged that the drill ing device but otherwise sliding fit corresponding splines or ribs 15 on an annular key 16 rotatively supported in a counterbore in the outer end of cylinder 7 The rotative movement of key 16 is limited by stops or lugs 17 on the latter which engage cooperating stops or lugs 18 on a nut 19 which is threaded into 'or otherwise secured to cylinder 7 A bushing 20 may be provided at the inner end of the counterbore inthe feed cylinder to provide a bearing for key 16. Bushing 20 and nut 19 are in spaced relation, as shown, to allow free rotative movement of key 16 through the arc indigated by the curved double .pointed arrows in ig. 3. I Referring now to Fig. 1 and assuming that the hole and that the steel-rotates in a counter clock-wise direction as indicated by the arrow, the sticking of the steel causesthe rest of the machine, as a result of reaction, to turn in a clockwise direction. As feed cylinder 7 and nut 19 are fastened together, they will rotate with the machine until stops 17 and 18 come shown 1n Fig. 3. Stops 17' on further rotation of the maincontact, as key 16 prevent chine by reason of the splined connection 14,

15 with piston 8 and the engagement of foot piece 9 with the wood, rock, or other supportingsurf'ace 00. To loosen the steel the operator now grips handle G and by pulling the same toward himself forcibly turns the drill steel in the hole through the arc indic'ated'by the arrows in Fig. 3. Upon releasing-the pull on handle C the machine is again free to rotate in a clock-wise direction until stops 17 and 18 againengage. This is repeated until the steel is freed.

' In Fig. 1 thereis a reversal of the connections of the telescoping members of the feedthe elements and the functioningof the same are identical with those previously described. Piston 8 is secured to drill A while 7 carries foot piece 9. A base member E (Figs. 4 and 5) having clamping jaws e, e encircling cylinder 7 and held in tight engagement with the same by a bolt 6 serves asthe support in this instance and permits the drill to be mounted on a column in the socket for a shell mounting.

In the modifications'shown in Figs. 6 to 8 inclusive, the rotation of the machine relative to the stationary foot piece is provided between the foot piece and; the feed device rather than within the feed device itself, as in the formpreviously described.

tension 21 threaded thereinto or otherwise fixedly secured to the'piston and may have a invention is not I In Figs. 6 and 7 the feedingpiston 8a has a splined which engage the support a" at spaced points.

Foot piece or rod 24 accordingly has a pivotal connection with piston extension 21 and the fanning or flaring of the bore a limited amount of rotative movement of the entire machine on foot piece 24 to permit the operator to rock the machine on its axis to release a stuck steel.

The modification shown in Fig. 8 is similar to that shown in Figs. 4 and 5 in that piston 86 has a splined connection with a nut 19?) in cylinder 7?) and has an extension, 25 threaded into the end of piston 86. Extension 25 is annular in shape and has a flange 2500 which serves to clamp to the piston a spurred foot piece 26 provided with a central bore 26a through extends Thus foot piece 26 is arranged for pivotal movement in a rotary sense upon piston 8b as an axis but by reason of its spurs it engages the supporting surface 00 in a fixed position. To limit the amount of permissive rotative movement of the machine relative to foot piece 26, extension 25 has a boss or projection 256 with a transverse bore through which extends a stop bar 27 of sufficient length to engage one or more of the spurred arms of foot piece 26..

Figs. 9 and 10 illustrate the use of a column or column bar F as asupport for the drilling apparatus by providing a clamping sleeve havingboltsg one of which extends through a bore 11a in a foot piece or extension 9a upon one of the telescoping members of the feeding device.

While the invention has been herein described in what are ferred forms, it is to be understood that the limited to the specific deall changes, modifitails thereof but covers the'scope of cations, and adaptations within the appended claims.

I claim as my invention; 1. In combination, a rock drill having a percussive motor, telescoping members form ing a presssure feeding device comprising a cylinder and a 'piston'slidable therewithin,

one of said members being secured to said motor, means on said other member for en gaging a support andfor resisting rotative movement, said piston having grooves, said cylinder having a counterbore adjacent its free end, an annular key in said counterbore having splines for slidably engaging the grooves in said piston, a nut for holding said key in place and permitting limited rotative movement of the same,

which extension 25 i now considered to be presaid key having a 23 permits i.

radial extension and said nut an axial extension, said extensions forming stops for direct engagement.

2. In combination, arock drill having a percussive motor, telescoping members forming a pressure feeding device comprising a cylinder and a piston slidable therewithin, one of said members being secured to said motor, means on said other member for en- 7 1o gaging a support and for resisting rotative movement, said cylinder having a counterbore adjacent its free end, a bushing in said counterbore, an annular key rotatably supported in said bushing, interengaging means on said key and said piston permitting relative axial movement only, and a nut for retaining said key and bushing in place having a fixed stop projection for direct engage- V ment by said key positively to limit the rotation of the latter.

3. In combination, a rock drill having a percussive motor, telescoping members forming a pressure feeding device comprising a cylinder and a piston slidable therewithin,

one of said members being secured to said motor, means on said other member for engaging a support and for resisting rotative" movement, said piston having grooves, said cylinder having a counterbore adjacent its free end, a bushing in said counterbore, an annular key rotatably supported in said bushing and having splines slidably engag ing the grooves in said piston, a nut for retaining said key and bushing in place, and

lugs on said key and nut arranged for direct engagement positivelyto limit the rotation of the former.

Signed by me at Detroit, in the county of Wayne and State of Michigan, this 2nd day of April, 1929.

GUSTAVE M. NELL. 

